Stabbed man stumbles into Sydney servo

A man has stumbled into western Sydney service station with stab wounds to his shoulder.

The 27-year-old turned up at a 7-Eleven service station at Prospect about 5.30am on Wednesday and he was treated for a stab wound and lacerations before being taken to Westmead Hospital, emergency services said.

Staff at the service station told AAP a man came into the store with blood running down his arm, while police say the man is assisting with inquiries.